The Jerusalem Talmud has a very telling line which says it all:
(My answer to this question at Quora.com)
׳זה לא בהכרח כשר, מה שאנחנו אוכלים – זה בסדר מבחינתך?’
(“What we’re eating is not necessarily kosher—is that OK with you?”)
It means “Jesus son of [the Lord’s Name]”—but only someone seeking to convert Jews to Christianity would think of uttering or writing such an expression, since Jews are forbidden from saying or writing the Lord’s name, and the idea of anyone literally being the son of God is a sacrilegious notion.
(Originally written in reply to a question at Quora.com)